hmm, Elena Dementieva does that on the pro level. maybe you could try slowly putting distance between them. have the Father sit further away. then next time a little further. then maybe make the daughter aware that the father is going to get some popcorn near the end of the second set. then say the father needs to leave around the middle of the second set for a meeting. Just keep making excuses for him to leave/distance himself and eventually she wont need him there at all.